How to Calculate faster than a Calculator
Vložit
- čas přidán 21. 03. 2024
- @tecmath This math multiplication trick is easy to do, and can be used to directly multiply large numbers! Math is easy with the tecmath math method of multiplication (say that five times fast!)
For how this works... go here
• How to Calculate Fast!...
For those who don't know this trick works on multiplying a two-digit number by a two-digit number, where both have the same tens-digit and the sum of their units-digits is 10.
Exactly! It's sad that people have to go to the comments or the full video to get that extra condition.
DANG this a gamechanger
It only works for about 10% of the combinations he mentioned here. There's another requirement:
*The sum of the two ones-digits must be 10.*
Need to watch the beginning of the full video he mentioned is linked in the Description to hear him say that part. Hopefully, people will do that before blindly using this trick. 😢
Edit: Fixed a mistake my phone so graciously made for me: "two ones-digits" not "ones ones" 😆😡
I could have been done with homework in twenty minutes. Darn.
... and could have had most of it wrong because he didn't tell the other requirement in this video to use this exact trick:
*The sum of the ones digits must be 10.*
Unless I'm missing something, this doesn't always work. I tried 33 x 37, and with this method it should come out to 1228, but the real answer is 1258. Is there an exception that wasn't explained?
Actually, 3*7=21. So the answer should be 1221, and it is.
@debwevans sorry typo. 34 x 37 = 1258, not 1228. I must be doing something wrong; 52 x 59 = 3018 with this method, but it comes out to 3068. I am noticing a pattern that I'm off by the 10s number on each, but not sure why
The conditions under which this works are 1) same tens digit and 2) ones digits add to ten.
4+7 =11
Now, it makes so much sense.@@debwevans
How does this work with 45x 49,47 x47 and 44 x 59 for example?
What the helll
Yep, only part of the information you need to know is mentioned here in this Short. The rest is in his full video.
Learning maths hurts my brain with the understanding that it's a great way of expanding the brain muscle 💪
It really hurts the brain when people don't give all the information, which could compel people to use a "trick" when they shouldn't. If it was a trick to get people to view the full video, that's a fail in this case. At least it was more fully explained at the beginning of the full video, not the end or in the middle somewhere.
Can someone explain how the first 4s become 20? I don’t understand what he’s saying. 😅
Because 1 more than 4 is 5, 4 x 5 is 20
Another example please
53 * 57 =
5+1=6 (add one to the matching tens digits)
5*6 = 30 (multiply tens digit by digit+1)
3*7= 21
Solution 3021.